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Polysomy is a condition found in many species, including fungi, plants, insects, and mammals, in which an organism has at least one more chromosome than normal, i.e., there may be three or more copies of the chromosome rather than the expected two copies. Most eukaryotic species are diploid, meaning they have two sets of chromosomes, whereas prokaryotes are haploid, containing a single chromosome in each cell. Aneuploids possess chromosome numbers that are not exact multiples of the haploid number and polysomy is a type of aneuploidy. A karyotype is the set of chromosomes in an organism and the suffix -somy is used to name aneuploid karyotypes. This is not to be confused with the suffix -ploidy, referring to the number of complete sets of chromosomes.

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  • Polysomy (en)
  • Polisomia (pl)
rdfs:comment
  • Polysomy is a condition found in many species, including fungi, plants, insects, and mammals, in which an organism has at least one more chromosome than normal, i.e., there may be three or more copies of the chromosome rather than the expected two copies. Most eukaryotic species are diploid, meaning they have two sets of chromosomes, whereas prokaryotes are haploid, containing a single chromosome in each cell. Aneuploids possess chromosome numbers that are not exact multiples of the haploid number and polysomy is a type of aneuploidy. A karyotype is the set of chromosomes in an organism and the suffix -somy is used to name aneuploid karyotypes. This is not to be confused with the suffix -ploidy, referring to the number of complete sets of chromosomes. (en)
  • Polisomia – stan, w którym w organizmie istnieje co najmniej jeden nadliczbowy chromosom, to znaczy liczba określonych chromosomów nie jest diploidalna - mogą to być trzy lub więcej kopii chromosomu zamiast spodziewanych dwu. Polisomia jest zwykle spowodowana przez nondysjunkcję (nieudaną próbę rozdzielenia chromosomów homologicznych) podczas mejozy, ale może również wystąpić przez mutację podczas translokacji. Zespół Downa jest przykładem polisomii. Osoby dotknięty tym syndromem mają trzy kopie (trisomia) chromosomu 21. (pl)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Brosen_flower_nn1.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Human_karyotype_with_bands_and_sub-bands.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/S_cerevisiae_under_DIC_microscopy.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/21_trisomy_-_Down_syndrome.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/AML-M2_associated_with_a_t(8;21)_chromosome_abnormality.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Human_karyotype_(259_31)_Karyotype_Human_47,XXY_(Klinefelter_syndrome).jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Karyotype_isochromosomeX.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Klinefelter's_syndrome.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Trisomy13.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/XYY_diagram.gif
  • http://commons.wikimedia.org/wiki/Special:FilePath/CFTR_gene_on_chromosome_7.svg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Nuchal_edema_in_Down_Syndrome_Dr._W._Moroder.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/FISH_(Fluorescent_In_Situ_Hybridization).jpg
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